EP3546189B1 - Injection molding machine - Google Patents
Injection molding machine Download PDFInfo
- Publication number
- EP3546189B1 EP3546189B1 EP19163671.1A EP19163671A EP3546189B1 EP 3546189 B1 EP3546189 B1 EP 3546189B1 EP 19163671 A EP19163671 A EP 19163671A EP 3546189 B1 EP3546189 B1 EP 3546189B1
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- EP
- European Patent Office
- Prior art keywords
- mold
- lubricant
- unit
- supply
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001746 injection moulding Methods 0.000 title claims description 36
- 239000000314 lubricant Substances 0.000 claims description 94
- 230000007246 mechanism Effects 0.000 claims description 82
- 238000011084 recovery Methods 0.000 claims description 61
- 238000001514 detection method Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 description 71
- 230000008569 process Effects 0.000 description 70
- 238000002347 injection Methods 0.000 description 46
- 239000007924 injection Substances 0.000 description 46
- 230000033001 locomotion Effects 0.000 description 39
- 239000012778 molding material Substances 0.000 description 35
- 238000000465 moulding Methods 0.000 description 17
- 230000002093 peripheral effect Effects 0.000 description 17
- 238000005304 joining Methods 0.000 description 15
- 238000005461 lubrication Methods 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000007788 liquid Substances 0.000 description 13
- 238000001816 cooling Methods 0.000 description 12
- 230000005856 abnormality Effects 0.000 description 9
- 238000005429 filling process Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000004886 process control Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/83—Lubricating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/66—Mould opening, closing or clamping devices mechanical
- B29C45/661—Mould opening, closing or clamping devices mechanical using a toggle mechanism for mould clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/84—Safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
- The present invention relates to an injection molding machine.
- An injection molding machine which opens or close a mold and clamps the mold using a toggle link mechanism is known. The toggle link mechanism is connected by a link and a connection 15 pin and a bush is installed between the link and the connection pin. However, if the mold is repeatedly opened and closed, the bush and the connection pin slide each other, and the bush is worn.
- Accordingly, a method is known, in which a lubricant such as oil is interposed between the bush and the connection pin so as to increase lubricity of a sliding surface, and wear of the bush decreases (
US Patent Application Publication No. 2,299,119 ).International Patent Application WO 2005/077639 A1 discloses a mold closing unit of an injection molding machine comprising lever joints and a lubricant supply and use of the lubricating device.Austrian Patent Application AT 509 983 A4 Japanese Patent Application JP 2003 211512 A - Meanwhile,
US Patent Application Publication No. 2, 299, 119 discloses a structure without a seal, in which a lubricant is sucked together with air. Accordingly, if a clogging is generated in a flow path of the air or a suction pump fails, and thus, a force for sucking the air is weakened or is stopped, there is a concern that the lubricant leaks to the outside. If the lubricant leaks to the outside, there is a concern that a device is contaminated or the lubricant adheres to a molding product. - Accordingly, an object of the present invention is to provide an injection molding machine which prevents leakage of the lubricant.
- According to an aspect of an embodiment, there is provided an injection molding machine including: a movable platen; a rear platen; a link mechanism which has a plurality of links, one end connected to the movable platen, and the other end connected to the rear platen; a lubricant supply device which supplies a lubricant to at least one connection portion of a connection portion which connects the movable platen and the link to each other, a connection portion which connects the links to each other, and a connection portion which connects the rear platen and the link to each other; and a control unit which controls the lubricant supply device, in which at least one connection portion of the connection portions includes a bush, a connection pin which is inserted into the bush, a supply path through which a lubricant is supplied to a bearing clearance which is a clearance between the bush and the connection pin, and a discharge path through which the lubricant is discharged from the bearing clearance, and the lubricant supply device includes a supply mechanism which is connected to the supply path and supplies the lubricant, and a discharge mechanism including a recovery pump, the discharge mechanism being connected to the discharge path and discharging the lubricant, and the control unit includes a detection unit which detects an operation state of the discharge mechanism and a suction state of air performed by the recovery pump, and a determination unit which determines whether or not to operate the supply mechanism based on a detection result of the detection unit.
- According to the present invention, it is possible to provide the injection molding machine which prevents leakage of the lubricant.
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Fig. 1 is a view showing a state when a mold opening of an injection molding machine according to the present embodiment is completed. -
Fig. 2 is a view showing a state when a mold of the injection molding machine according to the present embodiment is clamped. -
Fig. 3 is a configuration view of a toggle mechanism and a lubricant supply device. -
Fig. 4 is a sectional view taken along line A-A of a connection portion. -
Fig. 5 is a sectional schematic view explaining a lubrication structure between a connection pin and a bush in a connection portion of the present embodiment. -
Fig. 6 is a diagram explaining an example of a configuration of a discharge mechanism which discharges a lubricant and air from the connection portion. -
Fig. 7 is a function block diagram showing components of a control unit. -
Fig. 8 is a flowchart explaining a control of the lubricant supply device. - Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding reference numerals are assigned to the same or corresponding configurations, and descriptions thereof are omitted.
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Fig. 1 is a diagram showing a state when a mold opening of an injection molding machine according to the present embodiment is completed.Fig. 2 is a diagram showing a state when a mold of the injection molding machine according to the present embodiment is clamped. InFigs. 1 and2 , an X direction, a Y direction, and a Z direction are directions perpendicular to each other. The X direction and the Y direction indicate a horizontal direction, and the Z direction indicates a vertical direction. In a case where amold clamping unit 100 is a horizontal type mold clamping unit, the X direction is mold opening and closing directions, and the Y direction is a width direction of aninjection molding machine 10. As shown inFigs. 1 and2 , theinjection molding machines 10 includes themold clamping unit 100, anejector unit 200, aninjection unit 300, amovement unit 400, acontrol unit 700, and a frame 900. Hereinafter, each component of theinjection molding machine 10 will be described. - In descriptions of the
mold clamping unit 100, a movement direction (right direction inFigs. 1 and2 ) of amovable platen 120 when a mold is closed is defined as a front side, and a movement direction (left direction inFigs. 1 and2 ) of themovable platen 120 when the mold is opened is defined as a rear side. - The
mold clamping unit 100 performs closing, clamping, and opening on amold unit 800. For example, themold clamping unit 100 is a horizontal type clamping unit and the mold opening and closing directions are the horizontal direction. Themold clamping unit 100 includes a stationary platen 110, themovable platen 120, atoggle support 130, atie bar 140, atoggle mechanism 150, amold clamping motor 160, amotion conversion mechanism 170, and a moldspace adjustment mechanism 180. - The stationary platen 110 is fixed to the frame 900. A
stationary mold 810 is attached to a surface of the stationary platen 110 facing themovable platen 120. - The
movable platen 120 is movable in the mold opening and closing directions with respect to the frame 900. A guide 101 which guides themovable platen 120 is placed on the frame 900. Amovable mold 820 is attached to a surface of themovable platen 120 facing the stationary platen 110. - The
movable platen 120 moves forward or rearward with respect to the stationary platen 110, and thus, closing, clamping, and opening of the mold are performed. Themold unit 800 includes thestationary mold 810 and themovable mold 820. - The toggle support (rear platen) 130 is connected so as to be separated from the stationary platen 110, and is placed on the frame 900 to be movable in mold opening and closing directions. In addition, the
toggle support 130 may be movable along a guide which is placed on the frame 900. The guide of thetoggle support 130 may be also used as the guide 101 of themovable platen 120. - In addition, in the present embodiment, the stationary platen 110 is fixed to the frame 900, and the
toggle support 130 is movable in the mold opening and closing directions with respect to the frame 900. However, thetoggle support 130 may be fixed to the frame 900, and the stationary platen 110 may be movable in the mold opening and closing directions with respect to the frame 900. - The stationary platen 110 and the
toggle support 130 are connected to each other with a gap L in the mold opening and closing directions by thetie bar 140. A plurality of (for example, four)tie bars 140 may be used. Thetie bars 140 are parallel in the mold opening and closing directions and extend according to a mold clamping force. A tie bar strain detector 141 which detects strain of thetie bar 140 may be provided in at least onetie bar 140. The tie bar strain detector 141 sends a signal indicating a detection result to thecontrol unit 700. The detection result of the tie bar strain detector 141 is used for detection or the like of the mold clamping force. - In addition, in the present embodiment, the tie bar strain detector 141 is used as a mold clamping force detector which detects the mold clamping force. However, the present invention is not limited to this. The mold clamping force detector is not limited to a strain gauge type detector, and may be a piezoelectric type detector, a capacitance type detector, a hydraulic type detector, an electromagnetic type detector, or the like, and an attachment position of the mold clamping force detector is also not limited to the
tie bar 140. - The
toggle mechanism 150 is disposed between themovable platen 120 and thetoggle support 130 and moves themovable platen 120 in the mold opening and closing directions with respect to thetoggle support 130. Thetoggle mechanism 150 includes acrosshead 151, a pair of link groups, or the like. Each link group includes afirst link 152 and asecond link 153 which are bendably/strechably connected to each other by pins or the like. Thefirst link 152 is attached to themovable platen 120 so as to be oscillated by pins or like and thesecond link 153 is attached to thetoggle support 130 so as to be oscillated by pins or the like. Thesecond link 153 is attached to thecrosshead 151 via athird link 154. If thecrosshead 151 moves forward or rearward with respect to thetoggle support 130, thefirst link 152 and thesecond link 153 are bent and stretched and themovable platen 120 moves forward or rearward with respect to thetoggle support 130. - In addition, a configuration of the
toggle mechanism 150 is not limited to the configuration shown inFigs. 1 and2 . For example, inFigs. 1 and2 , the number of nodes of each link group is five. However, the number of nodes may be four, and one end portion of thethird link 154 may be connected to a node between thefirst link 152 and thesecond link 153. - The
mold clamping motor 160 is attached to thetoggle support 130 and operates thetoggle mechanism 150. Themold clamping motor 160 moves thecrosshead 151 forward or rearward with respect to thetoggle support 130, and thus, thefirst links 152 and thesecond links 153 are bent and stretched, and themovable platen 120 moves forward or rearward with respect to thetoggle support 130. Themold clamping motor 160 is directly connected to themotion conversion mechanism 170. However, themold clamping motor 160 may be connected to themotion conversion mechanism 170 via a belt, a pulley, or the like. - The
motion conversion mechanism 170 converts a rotary motion of themold clamping motor 160 into a linear motion of thecrosshead 151. Themotion conversion mechanism 170 includes a screw shaft 171 and a screw nut 172 which is screwed to the screw shaft 171. A ball or a roller may be interposed between the screw shaft 171 and the screw nut 172. - The
mold clamping unit 100 performs a mold closing process, a mold clamping process, a mold opening process, or the like under the control of thecontrol unit 700. - In the mold closing process, the
mold clamping motor 160 is driven to move thecrosshead 151 forward to a mold closing completion position at a set speed. Accordingly, themovable platen 120 moves forward and themovable mold 820 comes into contact with thestationary mold 810. For example, a position or speed of thecrosshead 151 is detected using a mold clampingmotor encoder 161 or the like. The mold clampingmotor encoder 161 detects the rotation of themold clamping motor 160 and sends a signal indicating the detection result to thecontrol unit 700. In addition, a crosshead position detector which detects the position of thecrosshead 151 and a crosshead speed detector which detects the speed of thecrosshead 151 are not limited to the mold clampingmotor encoder 161, and a general detector can be used. In addition, a movable platen position detector which detects the position of themovable platen 120 and a movable platen speed detector which detects the speed of themovable platen 120 are not limited to the mold clampingmotor encoder 161, and a general detector can be used. - In the mold clamping process, the
mold clamping motor 160 is further driven to further move thecrosshead 151 forward from the mold closing completion position to a mold clamping position, and thus, a mold clamping force is generated. When the mold is clamped, a cavity space 801 (refer toFig. 2 ) is formed between themovable mold 820 and thestationary mold 810, and the cavity space 801 is filled with a liquid molding material by theinjection unit 300. A filled molding material is solidified, and thus, a molding product can be obtained. A plurality of cavity spaces 801 may be provided, and in this case, a plurality of molding products can be simultaneously obtained. - In the mold opening process, the
mold clamping motor 160 is driven to move thecrosshead 151 rearward from the mold opening start position to a mold opening completion position at a set speed. Accordingly, themovable platen 120 moves rearward, and themovable mold 820 is separated from thestationary mold 810. Thereafter, theejector unit 200 ejects the molding product from themovable mold 820. - Setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. For example, the speed or positions (including mold closing start position, speed switching position, mold closing completion position, and mold clamping position) of the
crosshead 151 and the mold clamping force in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. The mold closing start position, the speed switching position, the mold closing completion position, and the mold clamping position are arranged in this order from the rear side to the front side and indicate start points and end points of sections where the speed is set. The speed is set for each section. The speed switching position may be one or more. The speed switching position may not be set. Only one of the mold clamping position and the mold clamping force may be set. - Setting conditions are similarly set in the mold opening process. For example, the speed or positions (including mold opening start position, speed switching position, and mold opening completion position) of the
crosshead 151 in the mold opening process are collectively set as a series of setting conditions. The mold opening start position, the speed switching position, and the mold opening completion position are arranged in this order from the front side to the rear side and indicate start points and end points of sections where the speed is set. The speed is set for each section. The speed switching position may be one or more. The speed switching position may not be set. The mold opening start position and the mold clamping position may be the same as each other. In addition, the mold opening completion position and the mold opening/closing start position may be the same as each other. - In addition, instead of the speed, the positions, or the like of the
crosshead 151, a speed, positions, or the like of themovable platen 120 may be set. Moreover, instead of the position (for example, the mold clamping position) of the crosshead or the position of the movable platen, the mold clamping force may be set. - Meanwhile, the
toggle mechanism 150 amplifies a driving force of themold clamping motor 160 and transmits the amplified driving force to themovable platen 120. An amplification magnification of thetoggle mechanism 150 is also referred to as a toggle magnification. The toggle magnification is changed according to an angle θ (hereinafter, also referred to a "link angle θ") between thefirst link 152 and thesecond link 153. The link angle θ is obtained from the position of thecrosshead 151. When the link angle θ is 180°, the toggle magnification becomes the maximum value. - In a case where a space of the
mold unit 800 is changed by a change of themold unit 800, a temperature change of themold unit 800, or the like, a mold space adjustment is performed such that a predetermined mold clamping force is obtained when the mold is clamped. For example, in the mold space adjustment, the gap L between the stationary platen 110 and thetoggle support 130 is adjusted such that the link angle θ of thetoggle mechanism 150 at the time of a touch type where themovable mold 820 comes into contact with thestationary mold 810 becomes a predetermined angle. - The
mold clamping unit 100 includes the moldspace adjustment mechanism 180 which performs the mold space adjustment by adjusting the gap L between the stationary platen 110 and thetoggle support 130. The moldspace adjustment mechanism 180 includes ascrew shaft 181 which is formed on a rear end portion of thetie bar 140, ascrew nut 182 which is rotatably held by thetoggle support 130, and a moldspace adjustment motor 183 which rotates thescrew nut 182 screwed to thescrew shaft 181. - The
screw shaft 181 and thescrew nut 182 are provided for eachtie bar 140. A rotation of the moldspace adjustment motor 183 may be transmitted to a plurality ofscrew nuts 182 via arotation transmission portion 185. The plurality ofscrew nuts 182 can be synchronously rotated with each other. In addition, it is possible to rotate the plurality ofscrew nuts 182 individually by changing a transmission path of therotation transmission portion 185. - For example, the
rotation transmission portion 185 includes a gear or the like. In this case, a driven gear is formed on an outer periphery of eachscrew nut 182, a drive gear is attached to an output shaft of the moldspace adjustment motor 183, and an intermediate gear which engages with a plurality of driven gears and drives gears is rotatably held by a center portion of thetoggle support 130. In addition, therotation transmission portion 185 may include a belt, a pulley, or the like instead of the gear. - An operation of the mold
space adjustment mechanism 180 is controlled by thecontrol unit 700. Thecontrol unit 700 drives the moldspace adjustment motor 183 to rotate thescrew nut 182, and thus, the position of thetoggle support 130 which rotatably holds thescrew nut 182 with respect to the stationary platen 110 is adjusted, and the gap L between the stationary platen 110 and thetoggle support 130 is adjusted. - In addition, in the present embodiment, the
screw nut 182 may be rotatably held by thetoggle support 130 and thetie bar 140 on which thescrew shaft 181 is formed is fixed to the stationary platen 110. However, the present invention is not limited to this. - For example, the
screw nut 182 may be rotatably held by the stationary platen 110 and thetie bar 140 may be fixed to thetoggle support 130. In this case, it is possible to adjust the gap L by rotating thescrew nut 182. - In addition, the
screw nut 182 may be fixed to thetoggle support 130 and thetie bar 140 may be held rotatably by the stationary platen 110. In this case, it is possible to adjust the gap L by rotating thetie bar 140. - In addition, the
screw nut 182 maybe fixed to the stationary platen 110 and thetie bar 140 may be held rotatably by thetoggle support 130. In this case, it is possible to adjust the gap L by rotating thetie bar 140. - The gap L is detected using a mold space
adjustment motor encoder 184. The mold spaceadjustment motor encoder 184 detects a rotation amount or a rotation direction of the moldspace adjustment motor 183 and sends a signal indicating a detection result to thecontrol unit 700. The detection result of the mold spaceadjustment motor encoder 184 is used to monitor or control the position of thetoggle support 130 or the gap L. In addition, a toggle support position detector which detects the position of thetoggle support 130 and a gap detector which detects the gap L are not limited to the mold spaceadjustment motor encoder 184, and a general encoder can be used. - In the mold
space adjustment mechanism 180, the gap L is adjusted by rotating one of thescrew shaft 181 and thescrew nut 182 which are screwed to each other. A plurality of the moldspace adjustment mechanisms 180 may be used, and a plurality of the moldspace adjustment motors 183 may be used. - In addition, in the present embodiment, the mold
space adjustment mechanism 180 includes thescrew shaft 181 which is formed on thetie bar 140 and thescrew nut 182 which is screwed to thescrew shaft 181 in order to adjust the gap L. However, the present invention is not limited to this. - For example, the mold
space adjustment mechanism 180 may have a tie bar temperature controller which adjusts a temperature of thetie bar 140. The tie bar temperature controller is attached to eachtie bar 140, and the temperatures of the plurality of tie bars 140 are adjusted to be in conjunction with each other. As the temperature of thetie bar 140 increases, thetie bar 140 is lengthened by thermal expansion, and thus, the gap L increases. The temperatures of the plurality of tie bars 140 can be adjusted independently. - For example, the tie bar temperature controller includes a heating unit such as a heater and adjusts the temperature of the
tie bar 140 by heating. The tie bar temperature controller includes a cooler such as a water cooling jacket and may adjust the temperature of thetie bar 140 by cooling. The tie bar temperature controller may include both the heating unit and the cooler. - In addition, the
mold clamping unit 100 of the present embodiment is a horizontal type mold clamping unit in which the mold opening and closing directions are the horizontal direction. However, themold clamping unit 100 may be a vertical type mold clamping unit in which the mold opening and closing directions are the upward-downward direction. The vertical type mold clamping unit has a lower platen, an upper platen, a toggle support, a tie bar, a toggle mechanism, a mold clamping motor, or the like. One of the lower platen and the upper platen is used for a stationary platen, and the other one is used for a movable platen. A lower mold is attached to the lower platen and an upper mold is attached to the upper platen. The upper mold and the lower mold constitutes a mold unit. The lower mold may be attached to the lower platen via a rotary table. The toggle support is disposed below the lower platen and is connected to the upper platen via the tie bar. The tie bar connects the upper platen and the toggle support with a gap therebetween in the mold opening and closing directions. The toggle mechanism is disposed between the toggle support and the lower platen and lifts and lowers the movable platen. The mold clamping motor operates the toggle mechanism. In a case where the mold clamping unit is the vertical type mold clamping unit, in general, the number of the tie bars is three. In addition, the number of the tie bars is not limited to three. - In addition, the
mold clamping unit 100 of the present embodiment has themold clamping motor 160 as a drive source. However, themold clamping unit 100 may have a hydraulic cylinder instead of themold clamping motor 160. In addition, themold clamping unit 100 may have a linear motor for opening and closing a mold and may have an electromagnet for clamping a mold. - Similarly to the descriptions of the
mold clamping unit 100, in descriptions of theejector unit 200, the movement direction (right direction inFigs. 1 and2 ) of themovable platen 120 when the mold is closed is defined as the front side, and the movement direction (left direction inFigs. 1 and2 ) of themovable platen 120 when the mold is opened is defined as the rear side. - The
ejector unit 200 ejects the molding product from themold unit 800. Theejector unit 200 includes an ejector motor 210, amotion conversion mechanism 220, anejector rod 230, or the like. - The ejector motor 210 is attached to the
movable platen 120. The ejector motor 210 is directly connected to themotion conversion mechanism 220. However, the ejector motor 210 may be connected to themotion conversion mechanism 220 via a belt, a pulley, or the like. - The
motion conversion mechanism 220 converts a rotary motion of the ejector motor 210 into a linear motion of theejector rod 230. Themotion conversion mechanism 220 includes a screw shaft and a screw nut which is screwed to the screw shaft. A ball or a roller may be interposed between the screw shaft and the screw nut. - The
ejector rod 230 can move forward or rearward through a through-hole of themovable platen 120. A front end portion of theejector rod 230 comes into contact with amovable member 830 which is disposed to be movable forward or rearward inside themovable mold 820. The front end portion of theejector rod 230 may be connected to themovable member 830 or may not be connected to themovable member 830. - The
ejector unit 200 performs an ejection process under the control of thecontrol unit 700. - In the ejection process, the ejector motor 210 is driven to move the
ejector rod 230 forward from a standby position to an ejection position at a set speed, and thus, themovable member 830 moves forward and the molding product is ejected. Thereafter, the ejector motor 210 is driven to move theejector rod 230 rearward at a set speed, and thus, themovable member 830 moves rearward to an original standby position. For example, a position or speed of theejector rod 230 is detected using anejector motor encoder 211. Theejector motor encoder 211 detects the rotation of the ejector motor 210 and sends a signal indicating a detection result to thecontrol unit 700. In addition, an ejector rod position detector which detects the position of theejector rod 230 and an ejector rod speed detector which detects the speed of theejector rod 230 are not limited to theejector motor encoder 211, and a general detector can be used. - Unlike the descriptions of the
mold clamping unit 100 or the descriptions of theejector unit 200, in descriptions of theinjection unit 300, a movement direction (left direction inFigs. 1 and2 ) of ascrew 330 during filling is referred to as a front side, and a movement direction (right direction inFigs. 1 and2 ) of thescrew 330 during plasticizing is referred to as a rear side. - The
injection unit 300 is installed on aslide base 301 which is movable forward or rearward with respect to the frame 900, and is movable forward or rearward with respect to themold unit 800. Theinjection unit 300 comes into contact with themold unit 800, and the cavity space 801 inside themold unit 800 is filled with the molding material by theinjection unit 300. For example, theinjection unit 300 includes acylinder 310, anozzle 320, thescrew 330, aplasticizing motor 340, aninjection motor 350, apressure detector 360, or the like. - The
cylinder 310 heats the molding material which is supplied from asupply port 311 to the inner portion of thecylinder 310. For example, the molding material includes a resin or the like. For example, the molding material is formed into pellets and is supplied to thesupply port 311 in a solid state. Thesupply port 311 is formed on a rear portion of thecylinder 310. A cooler 312 such as a water cooling cylinder is provided on an outer periphery of the rear portion of thecylinder 310. Aheating unit 313 such as a band heater and thetemperature detector 314 are provided on an outer periphery of thecylinder 310 on a front side of the cooler 312. - The
cylinder 310 is divided into a plurality of zones in an axial direction (right and left directions inFigs. 1 and2 ) of thecylinder 310. Theheating unit 313 and thetemperature detector 314 are provided in each zone. Thecontrol unit 700 controls theheating unit 313 such that a detection temperature of thetemperature detector 314 becomes a set temperature for each zone. - The
nozzle 320 is provided on the front end portion of thecylinder 310 and presses themold unit 800. Theheating unit 313 and thetemperature detector 314 are provided on an outer periphery of thenozzle 320. Thecontrol unit 700 controls theheating unit 313 such that a detection temperature of thenozzle 320 becomes a set temperature. - The
screw 330 is disposed in thecylinder 310 so as to be rotatable and movable forward or rearward. If thescrew 330 rotates, the molding material is fed forward along spiral grooves of thescrew 330. The molding material is gradually melted by heat from thecylinder 310 while being fed forward. The liquid molding material is fed to a front portion of thescrew 330 and is accumulated in the front portion of thecylinder 310, and thus, thescrew 330 moves rearward. Thereafter, if thescrew 330 moves forward, the liquid molding material accumulated in front of thescrew 330 is injected from thenozzle 320 and the inside of themold unit 800 is filled with the liquid molding material. - A
backflow prevention ring 331 is attached to a front portion of thescrew 330 to be movable forward or rearward as a backflow prevention valve which prevents backflow of the molding material from the front side of thescrew 330 toward the rear side when thescrew 330 is pushed forward. - When the
screw 330 moves forward, thebackflow prevention ring 331 is pushed toward the rear side by the pressure of the molding material in front of thescrew 330 and moves rearward relatively to thescrew 330 to a close position (refer toFig. 2 ) at which a flow path of the molding material is closed. Accordingly, the molding material accumulated in front of thescrew 330 is prevented from flowing toward the rear side. - Meanwhile, when the
screw 330 rotates, thebackflow prevention ring 331 is pushed toward the front side by the pressure of the molding material fed forward along the spiral grooves of thescrew 330 and moves forward relatively to thescrew 330 to an open position (refer toFig. 1 ) at which the flow path of the molding material is open. Accordingly, the molding material is fed to the front side of thescrew 330. - The
backflow prevention ring 331 maybe either a co-rotation type ring which rotates together with thescrew 330 or a non-co-rotation type ring which does not rotate together with thescrew 330. - In addition, the
injection unit 300 may include a drive source which moves thebackflow prevention ring 331 forward or rearward with respect to thescrew 330 between the open position and the close position. - The
plasticizing motor 340 rotates thescrew 330. A drive source which rotates thescrew 330 is not limited to theplasticizing motor 340 and may be a hydraulic pump or the like, for example. - The
injection motor 350 moves thescrew 330 forward or rearward. A motion conversion mechanism or the like which converts a rotary motion of theinjection motor 350 into a linear motion of thescrew 330 is provided between theinjection motor 350 and thescrew 330. For example, the motion conversion mechanism includes a screw shaft and a screw nut which is screwed to the screw shaft. A ball, a roller, or the like may be provided between the screw shaft and the screw nut. A drive source which moves thescrew 330 forward or rearward is not limited to theinjection motor 350 and may be a hydraulic cylinder, for example. - The
pressure detector 360 detects a force transmitted between theinjection motor 350 and thescrew 330. The detected force is converted into a pressure by thecontrol unit 700. Thepressure detector 360 is provided on a transmission path of the force between theinjection motor 350 and thescrew 330 and detects the force applied to thepressure detector 360. - The
pressure detector 360 sends a signal indicating a detection result to thecontrol unit 700. The detection result of thepressure detector 360 is used to control or monitor a pressure received by thescrew 330 from the molding material, a back pressure with respect to thescrew 330, a pressure applied from thescrew 330 to the molding material, or the like. - The
injection unit 300 performs a plasticizing process, a holding pressure process, a filling process, or the like under the control of thecontrol unit 700. - In the plasticizing process, the
plasticizing motor 340 is driven to rotate thescrew 330 at a set rotational speed and the molding material is fed forward along the spiral grooves of thescrew 330 by thescrew 330. According to this, the molding material is gradually melted. Thescrew 330 moves rearward as the liquid molding material is fed to the front side of thescrew 330 and is accumulated in front of thecylinder 310. For example, the rotational speed of thescrew 330 is detected using aplasticizing motor encoder 341. Theplasticizing motor encoder 341 detects the rotation of theplasticizing motor 340 and sends a signal indicating a detection result to thecontrol unit 700. In addition, a screw rotational speed detector which detects the rotational speed of thescrew 330 is not limited to theplasticizing motor encoder 341, and a general detector may be used. - In the plasticizing process, in order to restrict an abrupt rearward movement of the
screw 330, theinjection motor 350 may be driven so as to apply a set back pressure to thescrew 330. For example, the back pressure with respect to thescrew 330 is detected using thepressure detector 360. Thepressure detector 360 sends a signal indicating a detection result to thecontrol unit 700. If thescrew 330 moves rearward to a plasticizing completion position and a predetermined amount of the molding materials is accumulated in front of thescrew 330, the plasticizing process is completed. - In the filling process, the
injection motor 350 is driven to move thescrew 330 forward at a set speed, and the cavity space 801 inside themold unit 800 is filled with the liquid molding material accumulated in front of thescrew 330. For example, a position or speed of thescrew 330 is detected using aninjection motor encoder 351. Theinjection motor encoder 351 detects the rotation of theinjection motor 350 and sends a signal indicating a detection result to thecontrol unit 700. If the position of thescrew 330 reaches a set position, switching (so called V/P switching) from the filling process to the holding pressure process is performed. The position at which the V/P switching is performed is also referred to a V/P switching position. The set speed of thescrew 330 may be changed according to the position of thescrew 330, the time, or the like. - In addition, in the filling process, after the position of the
screw 330 reaches the set position, thescrew 330 may be temporarily stopped at the set position, and thereafter, the V/P switching may be performed. Immediately before the V/P switching, instead of thescrew 330 being stopped, thescrew 330 may move forward or may move rearward at a very slow speed. Moreover, a screw position detector which detects the position of thescrew 330 and a screw movement speed detector which detects the movement speed of thescrew 330 are not limited to theinjection motor encoder 351, and a general detector can be used. - In the holding pressure process, the
injection motor 350 is driven to push thescrew 330 forward, a pressure (hereinafter, also referred to as a "holding pressure") of the molding material on a front end portion of thescrew 330 is held at a set pressure, and the molding material remaining inside thecylinder 310 is pressed toward themold unit 800. Insufficient molding materials can be replenished by cooling shrinkage in themold unit 800. For example, the holding pressure is detected using thepressure detector 360. Thepressure detector 360 sends a signal indicating a detection result to thecontrol unit 700. A set value of the holding pressure may be changed according to an elapsed time from the starting of the holding pressure process, or the like. - In the holdingpressure process, the molding material inside the cavity space 801 in the
mold unit 800 is gradually cooled, and when the holding pressure process is completed, an inlet of the cavity space 801 is closed by a solidified molding material. This state is referred to a gate seal and a backflow of the molding material from the cavity space 801 is prevented. A cooling process starts after the holding pressure process . In the cooling process, solidification of the molding material in the cavity space 801 is performed. In order to shorten a molding cycle time, the plasticizing process may be performed during the cooling process. - In addition, the
injection unit 300 of the present embodiment is an inline and screw type injection unit. However, theinjection unit 300 may be a preplasticizing type injection unit. The preplasticizing type injection unit supplies the melted molding material inside a plasticizing cylinder to an injection cylinder and injects the molding material from the injection cylinder into the mold unit. A screw is disposed to be rotatable or rotatable and movable forward or rearward in the plasticizing cylinder and a plunger is disposed to be movable forward or rearward in the injection cylinder. - In addition, the
injection unit 300 of the present embodiment is a horizontal type injection unit in which the axial direction of thecylinder 310 is the horizontal direction. However, theinjection unit 300 may be a vertical type injection unit in which the axial direction of thecylinder 310 is the upward-downward direction . The mold clamping unit combined with the verticaltype injection unit 300 may be a vertical type mold clamping unit or a horizontal type mold clamping unit. Similarly, the mold clamping unit combined with the horizontaltype injection unit 300 may be a horizontal type mold clamping unit or a vertical type mold clamping unit. - Similarly to the descriptions of the
injection unit 300, in descriptions of themovement unit 400, the movement direction (left direction inFigs. 1 and2 ) of thescrew 330 during filling is referred to as a front side, and the movement direction (right direction inFigs. 1 and2 ) of thescrew 330 during the plasticizing is referred to as a rear side. - The
movement unit 400 moves theinjection unit 300 forward or rearward with respect to themold unit 800. In addition, themovement unit 400 presses thenozzle 320 to themold unit 800 to generate a nozzle touch pressure. Themovement unit 400 includes ahydraulic pump 410, amotor 420 which is a drive source, ahydraulic cylinder 430 which is a hydraulic actuator, or the like. - The
hydraulic pump 410 includes afirst port 411 and asecond port 412. Thehydraulic pump 410 is a pump which can rotate in both directions and switches a rotation direction of themotor 420. Accordingly, a working liquid (for example, oil) is sucked from any one offirst port 411 and thesecond port 412 and is discharged from the other, and thus, a liquid pressure is generated. In addition, thehydraulic pump 410 sucks the working liquid from a tank and can discharge the working liquid from any one of thefirst port 411 and thesecond port 412. - The
motor 420 operates thehydraulic pump 410. Themotor 420 drives thehydraulic pump 410 in the rotation direction corresponding to a signal from thecontrol unit 700 and by the rotation torque corresponding to the control signal from thecontrol unit 700. Themotor 420 may be an electric motor or an electric servo motor. - The
hydraulic cylinder 430 includes a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to theinjection unit 300. The piston 432 divides the inside of the cylinder body 431 into afront chamber 435 which is a first chamber and arear chamber 436 which is a second chamber. The piston rod 433 is fixed to the stationary platen 110. - The
front chamber 435 of thehydraulic cylinder 430 is connected to thefirst port 411 of thehydraulic pump 410 via afirst flow path 401. The working liquid discharged from thefirst port 411 is supplied to thefront chamber 435 via thefirst flow path 401, and thus, theinjection unit 300 is pushed forward. Theinjection unit 300 moves forward, and thus, thenozzle 320 is pressed to thestationary mold 810. Thefront chamber 435 functions as a pressure chamber which generates the nozzle touch pressure of thenozzle 320 by the pressure of the working liquid supplied from thehydraulic pump 410. - Meanwhile, the
rear chamber 436 of thehydraulic cylinder 430 is connected to thesecond port 412 of thehydraulic pump 410 via a second flow path 402. The working liquid discharged from thesecond port 412 is supplied to therear chamber 436 of thehydraulic cylinder 430 via the second flow path 402, and thus, theinjection unit 300 is pushed rearward. Theinjection unit 300 moves rearward and thus, thenozzle 320 is separated from thestationary mold 810. - In addition, in the present embodiment, the
movement unit 400 includes thehydraulic cylinder 430. However, the present invention is not limited to this. For example, instead of thehydraulic cylinder 430, an electric motor and a motion conversion mechanism which converts a rotary motion of the electric motor into a linear motion of theinjection unit 300 may be used. - For example, the
control unit 700 includes a computer, and as shown inFigs. 1 and2 , thecontrol unit 700 includes a Central Processing Unit (CPU) 701, arecording medium 702 such as a memory, aninput interface 703, and anoutput interface 704. Thecontrol unit 700 performs various controls by causing theCPU 701 to execute a program stored in therecording medium 702. In addition, thecontrol unit 700 receives a signal from the outside through theinput interface 703 and transmits a signal to the outside through theoutput interface 704. - The
control unit 700 repeatedly performs the mold closing process, the mold clamping process, the mold opening process, or the like to repeatedly manufacture the molding product. In addition, thecontrol unit 700 performs the plasticizing process, the filling process, the holding pressure process, or the like between the mold clamping processes. A series of operations to obtain the molding product, for example, an operation from the start of the plasticizing process to the start of the next plasticizing process is also referred to as a "shot" or a "molding cycle". In addition, a time required for once shot is also referred to as a "molding cycle time". - For example, the once molding cycle includes the plasticizing process, the mold closing process, the mold clamping process, the filling process, the holding pressure process, the cooling process, the mold opening process, and the ejection process in this order. Here, this order is an order of the start of each process. The filling process, the holding pressure process, and the cooling process are performed between the start of the mold clamping process to the end of the mold clamping process. The end of the mold clamping process coincides with the start of the mold opening process. In addition, in order to shorten the molding cycle time, the plurality of processes may be simultaneously performed. For example, the plasticizing process maybe performed during the cooling process of the previous molding cycle, and in this case, the mold closing process may be performed at an initial stage of the molding cycle . In addition, the filling process may start during the mold closing process. Moreover, the ejection process may be started during the mold opening process. In a case where an on/off valve for opening or closing a flow path of the
nozzle 320, the mold opening process may be started during the plasticizing process. Accordingly, even when the mold opening process is started during the plasticizing process, the molding material does not leak from thenozzle 320 if the on/off valve closes the flow path of thenozzle 320. - The
control unit 700 is connected to anoperation unit 750 or adisplay unit 760. Theoperation unit 750 receives an input operation from a user and outputs a signal corresponding to the input operation to thecontrol unit 700. Thedisplay unit 760 displays an operation screen corresponding to the input operation in theoperation unit 750, under the control of thecontrol unit 700. - The operation screen is used for the setting of the
injection molding machine 10 or the like. A plurality of operation screens are provided, and thus, are displayed to be switched or to overlap each other. The user operates theoperation unit 750 while viewing the operation screen displayed on thedisplay unit 760 to perform the setting (including an input of a set value) of theinjection molding machine 10 or the like. - For example, the
operation unit 750 and thedisplay unit 760 may be configured of a touch panel to be integrated with each other. In addition, in the present embodiment, theoperation unit 750 and thedisplay unit 760 are integrated with each other. However, theoperation unit 750 and thedisplay unit 760 may be independently provided. In addition, a plurality ofoperation units 750 may be provided. - Next, a configuration of supplying a lubricant to a sliding surface of the
toggle mechanism 150 will be described with reference toFig. 3. Fig. 3 is a configuration view of thetoggle mechanism 150 and alubricant supply device 500 included in theinjection molding machine 10 according to the present embodiment. - As shown in
Fig. 3 , aconnection portion 40 which connects a bearing 121 of themovable platen 120 and thefirst link 152 to each other by aconnection pin 50 is formed. Similarly, aconnection portion 40 which connects thefirst link 152 and thesecond link 153 to each other by aconnection pin 51 is formed. Aconnection portion 40 which connects thesecond link 153 and abearing 131 of thetoggle support 130 to each other by aconnection pin 52 is formed. Aconnection portion 40 which connects thesecond link 153 and thethird link 154 to each other by a connection pin 53 is formed. Aconnection portion 40 which connects thethird link 154 and thecrosshead 151 to each other by aconnection pin 54 is formed. - In the
connection portion 40 of theconnection pin 50, theconnection pin 50 is detent-fixed to a bearing hole of thefirst link 152 which is one connection member, a bush 55 (refer toFig. 4 ) is pressure-fitted into the bearing 121 of themovable platen 120 which is the other connection member, and a sliding surface between thebush 55 and theconnection pin 50 is lubricated. In addition, theconnection pin 50 may be detent-fixed to the bearing hole of themovable platen 120, the bush may be pressure-fitted into the bearing of thefirst link 152, and the sliding surface between the bush and theconnection pin 50 may be lubricated. Similarly, in theconnection portions 40 of the connection pins 51 to 54, the connection pins 51 and 54 may be detent-fixed to one connection member, the bushes may be pressure-fitted into the other connection member, and sliding surfaces between the bushes and the connection pins 51 and 54 may be lubricated. - In
Fig. 3 and the following descriptions, a configuration of lubricating the sliding surface in theconnection portion 40 of theconnection pin 50 will be described as an example. The present invention may be applied to configurations of lubricating the sliding surfaces in theconnection portions 40 of the other connection pins 51 to 54. In addition, the present invention may be applied to at least one connection portion of theconnection portions 40. - The
injection molding machine 10 includes thelubricant supply device 500. Thelubricant supply device 500 has areservoir tank 501, asupply pump 502, arecovery pump 503, and a gas-lubricant separator 504. In addition, thelubricant supply device 500 may be independently provided for eachconnection portion 40 or a flow path may branch off such that thelubricant supply device 500 is commonly used. - The
reservoir tank 501 is a container which can store the lubricant. In addition, a type of the lubricant is not particularly limited, and for example, the lubricant may be grease or oil. Thesupply pump 502 supplies the lubricant from thereservoir tank 501 to supply connection ports 61 (refer toFig. 4 ) of theconnection portion 40. - The
recovery pump 503 is connected to recovery connection ports 69 (refer toFig. 4 ) of theconnection portion 40 via the gas-lubricant separator 504 and recovers the lubricant by sucking air from therecovery connection ports 69. The lubricant recovered together with the air is separated into the air and the lubricant by the gas-lubricant separator 504, the separated air is sucked by therecovery pump 503, foreign substances of the separated lubricant are removed by a filter (not shown), and the lubricant is returned to thereservoir tank 501. In addition, arrows shown in the flow path of thelubricant supply device 500 indicate flow directions of the lubricant. -
Fig. 4 is a sectional view taken along line A-A of theconnection portion 40.Fig. 5 is a sectional schematic view explaining a lubrication structure between theconnection pin 50 and thebush 55 in theconnection portion 40 of the present embodiment. In addition, inFig. 5 , only onebush 55 of twobushes 55 inFig. 4 and theconnection pin 50 are shown, and thefirst link 152 is omitted. In addition, inFig. 5 , an axial direction of theconnection pin 50 is a right-left direction on a paper surface. Moreover, the axial direction of theconnection pin 50 is the Y direction (refer toFig. 1 ). - The
supply connection port 61 is provided on an end surface of theconnection pin 50, and asupply path 62 extending in the axial direction of theconnection pin 50 from thesupply connection port 61 is provided in theconnection pin 50. That is, thesupply connection port 61 is provided on one end of thesupply path 62. Asupply path 63 extending in a radial direction of theconnection pin 50 are provided on the other end side of thesupply path 62, and the other end side of thesupply path 63 is opened to a supplypath opening portion 64 provided on an outer peripheral surface of theconnection pin 50. -
Collection grooves 66 which are ring-shaped grooves are formed on an inner peripheral surface of thebush 55 which is pressure-fitted into the bearing 121 of themovable platen 120. Thecollection grooves 66 are disposed on both outer sides such that the supplypath opening portions 64 are interposed therebetween in the axial direction of theconnection pin 50. - The bearing
clearance 65 through which the lubricant is supplied is formed between the inner peripheral surface of thebush 55 and the outer peripheral surface of theconnection pin 50 between the twocollection grooves 66. Moreover,outer bearing clearances 65S are formed between the inner peripheral surface of thebush 55 and the outer peripheral surface of theconnection pin 50 on the outside in the axial direction from thecollection grooves 66. - Moreover, a recessed
groove 67a which connects the twocollection grooves 66 to each other is provided on an outer peripheral surface of thebush 55. Thebush 55 is pressure-fitted into thebearing 121, and thus, a recovery path 67 is formed between the recessedgroove 67a and an inner peripheral surface of the bearing hole of thebearing 121. - A
recovery path 68 which communicates from the inner peripheral surface of the bearing hole to an outer peripheral surface thereof is provided in thebearing 121 into which thebush 55 is pressure-fitted. An inner peripheral surface side of therecovery path 68 communicates with the recovery path 67. An outer peripheral surface side of therecovery path 68 becomes therecovery connection port 69. In addition, when thebush 55 is pressure-fitted into thebearing 121, thebush 55 is pressure-fitted such that an inner peripheral surface-side opening portion of therecovery path 68 faces the recessedgroove 67a of thebush 55, and the recovery path 67 and therecovery path 68 can communicate with each other. - Next, a flow of the lubricant will be described. The lubricant supplied from the
supply connection port 61 by thesupply pump 502 flows through thesupply path 62 as shown by an arrow A1, branches off so as to flow through thesupply path 63, and is supplied to the supplypath opening portion 64 formed on the outer peripheral surface of theconnection pin 50. In addition, the lubricant supplied from the supplypath opening portions 64 flows from the supplypath opening portions 64 to thecollection grooves 66 through the bearingclearance 65 which is the clearance between the inner peripheral surface of thebush 55 and the outer peripheral surface of theconnection pin 50, and thus, the lubricant lubricates the sliding surfaces of thebush 55 and theconnection pin 50. - A pressure inside each
collection groove 66 is more negative than a pressure of an external space by an operation of therecovery pump 503. Accordingly, a flow of air from the external space toward thecollection groove 66 is generated in theouter bearing clearance 65S, and thus, even when a seal member or the like is not used in theouter bearing clearance 65S, it is possible to prevent the lubricant from flowing to the external space via theouter bearing clearance 65S. - In addition, as shown by arrows B1, the air flowing from the external space into the
collection grooves 66 via theouter bearing clearances 65S is sucked from therecovery connection port 69 through the recovery path 67 and therecovery path 68 to therecovery pump 503 via the gas-lubricant separator 504. In addition, the lubricant flowing from the bearingclearance 65 into thecollection grooves 66 flows into the gas-lubricant separator 504 from therecovery connection port 69 through the recovery path 67 and therecovery path 68 by the flows of the air shown by the arrows B1. Thereafter, foreign substances of the lubricant separated from the air by the gas-lubricant separator 504 are removed by a filter (not shown), and the lubricant is returned to thereservoir tank 501. - Moreover, the case where the
supply connection port 61, thesupply paths path opening portion 64 are formed in theconnection pin 50 is described. However, the lubricant may be supplied from a supply path opening portion, which is formed in thebearing 121 and thebush 55 and is provided on the inner peripheral surface of thebush 55, to thebearing clearance 65. In addition, the case where thecollection grooves 66 are formed on thebush 55 is described. However, thecollection grooves 66 may be formed on theconnection pin 50. -
Fig. 6 is a diagram explaining an example of a configuration of adischarge mechanism 70 which discharges lubricant and the air from the connection portion. Here, a configuration in which fourconnection portions 40A to 40D are provided as the connection portion is described as an example. In addition, each of theconnection portions 40A to 40D may be any one of theconnection portions 40 of the connection pins 50 to 54 shown inFig. 3 . - The
discharge mechanism 70 includes therecovery pump 503, the gas-lubricant separator 504,pipes 71A to 77 which form the flow paths, and joiningportions - In the example shown in
Fig. 6 , the lubricant is supplied from thereservoir tank 501 to thesupply connection ports 61 of therespective connection portions 40A to 40D by thesupply pump 502. - Moreover, one end of the
pipe 71A is connected to therecovery connection port 69 of theconnection portion 40A, and the other end of thepipe 71A is connected to one supply port of the joiningportion 72A. One end of thepipe 71B is connected to therecovery connection port 69 of theconnection portion 40B, and the other end of thepipe 71B is connected to the other supply port of the joiningportion 72A. The joiningportion 72A has two supply ports and one discharge port. One end of thepipe 73A is connected to the discharge port of the joiningportion 72A, and the other end of thepipe 73A is connected to one supply port of the joiningportion 74. - Similarly, one end of the pipe 71C is connected to the
recovery connection port 69 of theconnection portion 40C, and the other end of the pipe 71C is connected to one supply port of the joiningportion 72B. One end of thepipe 71D is connected to therecovery connection port 69 of theconnection portion 40D, and the other end of thepipe 71D is connected to the other supply port of the joiningportion 72B. The joiningportion 72B has two supply ports and one discharge port. One end of thepipe 73B is connected to the discharge port of the joiningportion 72B, and the other end of thepipe 73B is connected to the other supply port of the joiningportion 74. - The joining
portion 74 has two supply ports and one discharge port. One end of thepipe 75 is connected to the discharge port of the joiningportion 74 and the other end of thepipe 75 is connected to an inlet of the gas-lubricant separator 504. One end of thepipe 76 is connected to a gas outlet of the gas-lubricant separator 504. The other end of thepipe 76 is connected to a suction port of therecovery pump 503. The pipe 77 is connected to a discharge port of therecovery pump 503. - According to this configuration, the lubricant and the air discharged from the
connection portion 40A flows from therecovery connection port 69 into the gas-lubricant separator 504 through thepipe 71A, the joiningportion 72A, thepipe 73A, the joiningportion 74, and thepipe 75. In addition, the gas (air) and the lubricant are separated from each other by the gas-lubricant separator 504, and the separated lubricant is stored. The separated gas is sucked by therecovery pump 503 via thepipe 76, and is discharged to the outside through the pipe 77. Moreover, this is similarly applied to each of theconnection portions 40B to 40D. - Meanwhile, clogging is generated in the pipe due to metal powder generated by wear of the
bush 55, clogging is generated in theouter bearing clearances 65S due to dust flowing from the external space into thecollection grooves 66 via theouter bearing clearances 65S, and thus, there is a concern that suction of thecollection grooves 66 cannot be appropriately performed by therecovery pump 503. In addition, there is a concern that the suction of thecollection grooves 66 cannot be appropriately performed by therecovery pump 503 due to damages of a connection failure of the pipe, a failure of therecovery pump 503, or the like. If the suction of thecollection grooves 66 cannot be appropriately performed, the lubricant flowing from the bearingclearance 65 into thecollection grooves 66 is not discharged, and there is a concern that the lubricant leaks from theouter bearing clearances 65S to the external space. - Accordingly, the
injection molding machine 10 according to the present embodiment is provided with a detector 505 (refer toFig. 7 described later) for detecting whether or not the suction in thecollection grooves 66 is normally operated by therecovery pump 503 - For example, a gas flow meter may be used as the
detector 505 which detects suction states of thecollection grooves 66 performed by therecovery pump 503. The gas flow meter is disposed on a flow path of thedischarge mechanism 70, and if a measured flow rate is equal to or more than a predetermined threshold value, the gas flow meter can determine that the suction of thecollection grooves 66 is normally operated by therecovery pump 503. Moreover, it is not preferable that the air containing the lubricant flows into the gas flow meter, and thus, for example, the detector is provided at adetector position 83 at which the flow rate of the gas flowing through thepipe 76 connecting the gas outlet of the gas-lubricant separator 504 and therecovery pump 503 to each other is measured. Moreover, in a case where the detector is provided in other pipes, it is preferable that the gas flow meter and lubricant separation means (not shown) are commonly used. - Moreover, a pressure gauge may be used as the
detector 505. The pressure gauge is disposed to branch off from the flow path of thedischarge mechanism 70.
As a flow velocity of the air flowing through the flow path increases, a value detected by the pressure gauge decreases. Accordingly, based on a detection value of the pressure gauge, it is possible to determine whether or not the suction of the lubricant in thecollection grooves 66 by therecovery pump 503 is normally operated. - In addition, as the
detector 505, a combination of a light emitting element and a light receiving element of laser light may be used. A window through which the laser light passes is provided in the pipe of thedischarge mechanism 70, the laser light from the light emitting element provided outside the pipe traverses the flow path via the window and is incident to the light receiving element provided outside the pipe via the window. In a case where the suction of the lubricant in thecollection grooves 66 by therecovery pump 503 is normally operated, the lubricant flows through the flow path, and thus, the laser light is obstructed. Accordingly, by detecting whether or not the laser light can be detected by the light receiving element, it is possible to determine whether or not the suction of thecollection grooves 66 by therecovery pump 503 is normally operated. - In addition, as the
detector 505, a video camera may be used. A window through which the inside of the flow path can be imaged from the outside of the pipe, the lubricant flowing through the flow path is imaged by the video camera, and thus, it is possible to determine whether or not the lubricant flows. - Next, a position at which the
detector 505 is positioned and a detection range of thedetector 505 will be described. For example, in a case where thedetector 505 is provided in only adetector position 81A of thepipe 71A, if abnormality such as clogging is generated in any one ofpipes recovery pump 503, it is possible to detect the abnormality. However, by only thedetector 505 provided at thedetector position 81A, it is not possible to specify at which position the abnormality such as clogging is generated. This is similarly applied to a case where thedetector 505 is provided in only each of the detector positions 81A to 81D. - In a case where the
detector 505 is provided in thedetector position 82A of thepipe 73A, if abnormality such as clogging is generated in any one ofpipes recovery pump 503, it is possible to detect the abnormality. However, by only thedetector 505 provided at thedetector position 82A, it is notpossible to specify at which position the abnormality such as clogging is generated. This is similarly applied to a case where thedetector 505 is provided in only thedetector position 82B. - Moreover, in a case where the
detectors 505 are respectively provided in the detector positions 81A to 81D of thepipes 71A to 71D, if the abnormality such as the clogging is generated in any one of thepipes 71A to 71D, 73A and 73B, 75, 76, and 77, and therecovery pump 503, it is possible to detect the abnormality. In addition, by providing thedetectors 505 in the detector positions 81A to 81D respectively, it is possible to specify to what extent the abnormality such as the clogging is generated at which position. -
Fig. 7 is a function block diagram showing components of thecontrol unit 700 provided in theinjection molding machine 10 according to the present embodiment. In addition, each function block shown inFig. 7 is a conceptual block, and it is not necessarily physically configured as shown in the drawings. It is possible to configure all or a portion of respective functional blocks by functionally or physically dispersing and coupling in arbitrary units . All or a portion of each processing function performed in each functional block can be realized by a program executed by the CPU or can be realized as hardware by wired logic. - The
control unit 700 includes adetection unit 710, adetermination unit 720, alubrication control unit 730, and aprocess control unit 740. Thedetection unit 710 acquires a detection value of thedetector 505. Thedetermination unit 720 determines an operation state of thedischarge mechanism 70 based on a detection value acquired by thedetection unit 710. Thelubrication control unit 730 controls operations and stopping of thesupply pump 502 and therecovery pump 503. Theprocess control unit 740 controls each portion (here,mold clamping motor 160 is exemplified) of theinjection molding machine 10 along the respective process (the plasticizing process, the mold closing process, the mold clamping process, the filling process, the holding pressure process, the cooling process, the mold opening process, and the ejection process) of the molding cycle. - Next, a control of the
lubricant supply device 500 provided in theinjection molding machine 10 according to the present embodiment will be described with reference toFig. 8. Fig. 8 is a flowchart explaining the control of thelubricant supply device 500 provided in theinjection molding machine 10 according to the present embodiment. - In Step S101, the
lubrication control unit 730 of thecontrol unit 700 operates therecovery pump 503. - In Step S102, the
detection unit 710 of thecontrol unit 700 acquires the detection value related to the operation state of thedischarge mechanism 70 from thedetector 505. For example, in a case where thedetector 505 is a flow meter, thedetection unit 710 acquires a flow rate which is a detection value of the flow meter. - In Step S103, the
determination unit 720 of thecontrol unit 700 determines whether or not thedischarge mechanism 70 is normally operated from the detection value acquired in Step S102. For example, in the case where thedetector 505 is the flow meter, thedetermination unit 720 determines that thedischarge mechanism 70 is normally operated when the detected flow rate is equal or more than the predetermined threshold value, and thedetermination unit 720 determines that thedischarge mechanism 70 is not normally operated when the detected flow rate is less than the predetermined threshold value. In a case where it is determined that thedischarge mechanism 70 is normally operated (Yes in S103), the processing proceeds to Step S107, and it is determined that the operation of thesupply pump 502 is permitted (operation permission determination). In addition, the processing of thecontrol unit 700 proceeds to Step S108. - Meanwhile, in a case where it is determined that the
recovery pump 503 is not normally operated (No in S103), the processing proceeds to Step S104, it is determined that the operation of thesupply pump 502 is not permitted (operation non-permission determination). In addition, in Step S105, thelubrication control unit 730 stops therecovery pump 503. Moreover, in Step S106, thedetermination unit 720 transmits an error signal indicating that lubrication is not appropriately performed and ends the processing. In addition, the error signal is issued, and thus, thecontrol unit 700 may display this fact on thedisplay unit 760. - In Step S108, the
lubrication control unit 730 operates thesupply pump 502. - In Step S109, the
detection unit 710 acquires the detection value related to the operation state of thedischarge mechanism 70 from thedetector 505. For example, similarly to Step S102, in the case where thedetector 505 is the flow meter, thedetection unit 710 acquires the flow rate which is the detection value of the flow meter. - In Step S110, the
determination unit 720 of thecontrol unit 700 determines whether or not thedischarge mechanism 70 is normally operated from the detection value acquired in Step S109. For example, in the case where thedetector 505 is the flow meter similarly to Step S103, thedetermination unit 720 determines that thedischarge mechanism 70 is normally operated when the detected flow rate is equal or more than the predetermined threshold value, and thedetermination unit 720 determines that thedischarge mechanism 70 is not normally operated when the detected flow rate is less than the predetermined threshold value . In a case where it is determined that thedischarge mechanism 70 is normally operated (Yes in S110), the processing proceeds to Step S114, and it is determined that the operation of thesupplypump 502 is permitted (operation permission determination) . In addition, the processing of thecontrol unit 700 proceeds to Step S115. - Meanwhile, in the case where it is determined that the
recovery pump 503 is not normally operated (No in S110), the processing proceeds to Step S111, it is determined that the operation of thesupply pump 502 is not permitted (operation non-permission determination). In addition, in Step S112, thelubrication control unit 730 stops thesupply pump 502 and therecovery pump 503. Moreover, in Step S113, thedetermination unit 720 transmits an error signal indicating that lubrication is not appropriately performed and ends the processing. In addition, the error signal is issued, and thus, thecontrol unit 700 may display this fact on thedisplay unit 760. Moreover, theprocess control unit 740 may stop themold clamping motor 160. - In Step S115, the
determination unit 720 determines whether or not driving of theinjection molding machine 10 ends. In a case where the driving ends (Yes in S115), the processing of thecontrol unit 700 proceeds to Step S116. In Step S116, thelubrication control unit 730 stops thesupply pump 502 and therecovery pump 503, and the processing ends. - Hereinbefore, according to the
injection molding machine 10 according to the present embodiment, when thedischarge mechanism 70 is not normally operated, the supply of the lubricant to thebearing clearance 65 by thesupply pump 502 is stopped. Accordingly, it is possible to prevent the lubricant from overflowing from thecollection grooves 66 and from flowing to the outside from theouter bearing clearances 65S. Accordingly, contamination of the device by the lubricant can be prevented, and it is possible to prevent the lubricant from adhering to the molding product. - In addition, as described in Step S101 to Step S108, it is determined whether or not the
discharge mechanism 70 is normally operated before thesupply pump 502 is operated, and when thedischarge mechanism 70 is not normally operated, the operation of thesupply pump 502 is not permitted, and thus, it is possible to prevent the lubricant flowing to outside from theouter bearing clearances 65S. - Moreover, in the example of
Fig. 8 , in Step S101, therecovery pump 503 is operated before thesupply pump 502 is operated, and thesupply pump 502 is operated after it is determined that the operation state of thedischarge mechanism 70 is determined. However, the present invention is not limited to this, and the operation state may be acquired after thesupply pump 502 and therecovery pump 503 are operated. That is, after therecovery pump 503 and thesupply pump 502 are operated in Step S101, the processing may proceed to Step S109, and thereafter, the operation state of thedischarge mechanism 70 may be determined. Accordingly, it is possible to shorten a start-up time when theinjection molding machine 10 starts. - Hereinbefore, the embodiment of the injection molding machine or the like is described. However, the present invention is not limited to the above-described embodiment or the like, and various modifications and improvements can be made within the scope of the present invention described in claims.
-
- 10:
- injection molding machine
- 100:
- mold clamping unit
- 40, 40A to 40D:
- connection portion
- 50 to 54:
- connection pin
- 55:
- bush
- 61:
- supply connection port
- 62, 63:
- supply path
- 64:
- supply path opening portion
- 65:
- bearing clearance
- 65S:
- outer bearing clearance
- 66:
- collection groove
- 67, 68:
- recovery path (discharge path)
- 69:
- recovery connection port
- 70:
- discharge mechanism
- 110:
- stationary platen
- 120:
- movable platen
- 130:
- toggle support (rear platen)
- 150:
- toggle mechanism
- 151:
- crosshead (link)
- 152:
- first link (link)
- 153:
- second link (link)
- 154:
- third link (link)
- 500:
- lubricant supply device
- 501:
- reservoir tank
- 502:
- supply pump (supply mechanism)
- 503:
- recovery pump (discharge mechanism)
- 504:
- gas-lubricant separator
- 505:
- detector
- 700:
- control unit
- 710:
- detection unit
- 720:
- determination unit
- 730:
- lubrication control unit
- 740:
- process control unit
Claims (4)
- An injection molding machine (10) comprising:a movable platen (120);a rear platen (130);a link mechanism (150) which has a plurality of links (151, 152, 153, 154), one end connected to the movable platen (120), and the other end connected to the rear platen (130);a lubricant supply device (500) configured to supply a lubricant to at least one connection portion (40) of a connection portion which connects the movable platen (120) and the link (151, 152, 153, 154) to each other, a connection portion which connects the links (151, 152, 153, 154) to each other, and a connection portion which connects the rear platen (130) and the link (151, 152, 153, 154) to each other; anda control unit (700) configured to control the lubricant supply device (500), whereinat least one connection portion (40) of the connection portions includesa bush (55),a connection pin (50, 51, 52, 53, 54) which is inserted into the bush (55),a supply path (62, 63) through which a lubricant is supplied to a bearing clearance (65) which is a clearance between the bush (55) and the connection pin (50, 51, 52, 53, 54), anda discharge path (67, 68) through which the lubricant is discharged from the bearing clearance (65),the lubricant supply device (500) includesa supply mechanism (502) which is connected to the supply path (62, 63) and configured to supply the lubricant, characterized in that the lubricant supply device further includesa discharge mechanism (70) including a recovery pump (503), the discharge mechanism (70) being connected to the discharge path (67, 68) and being configured to discharge the lubricant, andthe control unit (700) includesa detection unit (710) configured to detect an operation state of the discharge mechanism (70) and a suction state of air performed by the recovery pump (503), anda determination unit (720) configured to determine whether or not to operate the supply mechanism (502) based on a detection result of the detection unit (710).
- The injection molding machine (10) according to claim 1,
wherein the control unit (700) is configured to stop the supply mechanism (502) in a case where the determination unit (720) determines that the discharge mechanism (70) is not normally operated. - The injection molding machine (10) according to claim 1 or 2,wherein the control unit (700) is configured to operate the discharge mechanism (70) before operating the supply mechanism (502), andwherein the control unit (700) is configured to operate the supply mechanism (502) in a case where the determination unit (720) determines that the discharge mechanism (70) is normally operated.
- The injection molding machine (10) according to any one of claims 1 to 3,
wherein the connection portion (40) includes collection grooves (66) which are provided on both outer sides of a supply path opening portion (64) of the supply path (62, 63), which is an opening portion on the bearing clearance (65) side, in an axial direction of the connection pin (50, 51, 52, 53, 54).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018068781A JP7134673B2 (en) | 2018-03-30 | 2018-03-30 | Injection molding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3546189A1 EP3546189A1 (en) | 2019-10-02 |
EP3546189B1 true EP3546189B1 (en) | 2021-09-08 |
Family
ID=65903924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19163671.1A Active EP3546189B1 (en) | 2018-03-30 | 2019-03-19 | Injection molding machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3546189B1 (en) |
JP (1) | JP7134673B2 (en) |
CN (1) | CN110315726B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111715882B (en) * | 2020-05-14 | 2022-04-08 | 东莞市华研新材料科技有限公司 | Metal injection molding device with waste recovery mechanism |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2299119A (en) | 1939-09-09 | 1942-10-20 | Bliss E W Co | Bearing |
JPH0671412A (en) * | 1992-08-28 | 1994-03-15 | Toshiba Mach Co Ltd | Method for lubricating link device and link device with lubricating mechanism |
JPH11277600A (en) * | 1998-03-30 | 1999-10-12 | Sumitomo Heavy Ind Ltd | Method for controlling automatic grease supplying apparatus |
JP2000141436A (en) * | 1998-11-16 | 2000-05-23 | Toshiba Mach Co Ltd | Lubrication device for toggle link mechanism of injection molding machine or the like and lubrication method |
JP3730922B2 (en) * | 2002-01-18 | 2006-01-05 | 住友重機械工業株式会社 | Cooling device for injection molding machine |
WO2005077639A1 (en) * | 2004-02-14 | 2005-08-25 | Netstal-Maschinen Ag | Mold closing unit of an injection molding machine comprising lever joints and a lubricant supply and use of the lubricating device |
AT505342B1 (en) * | 2007-05-23 | 2009-02-15 | Engel Austria Gmbh | lubricator |
AT509983B1 (en) * | 2010-08-19 | 2012-01-15 | Engel Austria Gmbh | LUBRICATING DEVICE FOR AN INJECTION MOLDING MACHINE |
KR101935625B1 (en) * | 2014-12-16 | 2019-01-04 | 엘에스엠트론 주식회사 | Oil distribution device |
-
2018
- 2018-03-30 JP JP2018068781A patent/JP7134673B2/en active Active
-
2019
- 2019-03-19 EP EP19163671.1A patent/EP3546189B1/en active Active
- 2019-03-27 CN CN201910235678.0A patent/CN110315726B/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN110315726A (en) | 2019-10-11 |
EP3546189A1 (en) | 2019-10-02 |
JP7134673B2 (en) | 2022-09-12 |
JP2019177618A (en) | 2019-10-17 |
CN110315726B (en) | 2023-10-31 |
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